Static pressure decreases pump work

In summary, the conversation discusses the theory of using a pump to move water from an open reservoir 20 ft above to a reservoir 80 ft above. The static pressure from the suction reservoir will decrease the pump's work, but it will not be enough to make the water level rise on the discharge side without the pump doing work. The equilibrium height of the water on the discharge side will be equal to the height of the water on the suction side, which is 20 ft.
  • #1
humbleguy
4
0
Hey just wanted to know the theory behind this. If i have a open reservoir say 20 ft above a pump and i want to pump the water that flowing down on the suction side to a reservoir on the discharge side 80 ft above, the static pressure from the suction reservoir should decrease the pumps work,but will the static pressure be enough to make the water level rise on the discharge side of the pump with no work from the pump?
 
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  • #2
No, of course not. You need the pump to do work to move your water uphill.
 
  • #3
With 20 ft of head, you will get a 20 ft column of water meaning the pump has to make up there difference.
 
  • #4
xxChrisxx said:
With 20 ft of head, you will get a 20 ft column of water meaning the pump has to make up there difference.

Okay so your saying the equilibrium height of the water on the discharge column will be 20ft above the pump, same as the height of the water on the suction side?
 

1. What is static pressure?

Static pressure is the force per unit area exerted by a fluid against a surface in a direction perpendicular to the surface. In other words, it is the pressure of a fluid at rest.

2. How does static pressure affect pump work?

When the static pressure of a fluid decreases, the pump has to do less work to move the fluid. This is because there is less resistance against the pump, allowing it to move the fluid more easily.

3. Why does static pressure decrease pump work?

Static pressure decreases pump work because it reduces the amount of energy needed to overcome the resistance of the fluid. This is because the fluid is less dense and there is less pressure pushing back against the pump.

4. What factors can cause a decrease in static pressure?

A decrease in static pressure can be caused by a decrease in fluid density, a decrease in fluid height, or an increase in fluid velocity. It can also be affected by changes in temperature or atmospheric pressure.

5. How does a decrease in static pressure affect the efficiency of a pump?

A decrease in static pressure can actually improve the efficiency of a pump. This is because the pump does not have to work as hard to move the fluid, resulting in less energy consumption and a more efficient operation.

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